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The Collaborative International Dictionary of English v.0.48 (gcide)

off-line \off-line\ adj.
1. (Computers) Not connected; -- of computers or computer
peripherals normally connected or intended to be connected
to other computers by a communications line; as, we can't
print the document because the printer is off-line.
[Narrower terms: {disconnected, not ready, off};
{unconnected ] {on-line}

Syn: offline, off line(predicate).
[WordNet 1.5]

2. Hence: (fig.) Outside of or after a meeting or formal
discussion; as, we can discuss the details off-line; -- a
term used at meetings and conferences to suggest
postponing detailed discussion of a topic so as not to
occupy the time of a large group most of whom may not be
interested.
[PJC]